Strain-insulator.



F. G; WOODLOGK.

STRAIN INSULATOR.

APPLICATION FILED SEPT. 23, 1912.

Patented July 29, 1913.

:lll 1 'llllllll lfllillilllf FESTUS G. WOODLOCK, OF STrLOUIS, MISSOURI.

STRAIN-INSULATOR.

Application fled September 23, 1912. Serial No. 721,780.

Specification of Letters Patent.

Patented July 29, 1913.

To all whom it may concern Be it known that I, Fnsros G. WooDnooK, a citizen of the United States, and residing at St. Louis, in the State of Missouri, have invented certain new and useful Improvements in Strain-Insulators, of which the following is a specification.

This invention relates to insulators and more particularly to strain insulators of the turn-buckle type adapted to be used for supporting electrical conductors, for bracing masts, towers and poles supporting electrical conductors, or in other places where an insulator of the above type is required.

The objects of this invention are to construct a device of this character which will be compact, durable, and simple in construction, and which will be capable of withstanding highmechanical strains and also the hi h electrical strains incident to the use of big voltages.

Further ob ects will appear from the detail description taken in connection with the accompanying drawing, in which:

Figure 1 is an elevation of an insulator embodying this invention, and Fig. 2 is a longitudmal section on the line 22 Fig. 1,'parts being shown in elevation.

Referring to the accompanying drawing 10 designates a central body or shank of insulating material such as glass, porcelain or the like. This body or shank is corrugated or ribbed as shown at 11 in order to increase the surface or current creepa'ge distances between the parts which are electrically separated. Internally threaded sleeves 12 of brass or other suitable material are embedded in the ends of the body or shank, and these sleeves preferably taper or increase in diameter toward their inner ends and are each provided at their inner end with a flange or projection 13. By means of this construction the sleeves will be firmly anchored in the insulating body. Oppositely threaded eye bolts 14 having eyes 15 are screwed into the threaded sleeves. A central hole extends transversely of the insulating body, and this hole is lined with a sleeve 16 of brass or other suitable material which is embedded in the body and is provided with a flange or projection 17 to anchor the sleeve in the body.

;The insulating body can be molded in any suitable manner well known to those skilled in the art so that the body will be molded I j'-'around the sleeves 12 and 16 to embed these sleeves therein so as to form a unitary structure.

The device as completed will form a turnbedded in the ends thereof, and these boltreceiving members are in turn firmly anchored in the insulating body so that the device will possess great mechanical strength. Its insulating value will also be high since the terminals are separated by the body of the insulating material in which they are embedded.

The device can be adjusted to tighten or loosen the wire or cable in which it is inserted by rotating the body or shank 10. This can be done by inserting a tool such as a rod or screw driver into the central hole so that a great leverage may be obtained. This central hole is lined with a metallic sleeve so that abrasion of the brittle insulating material will be prevented, since the tool engages 'and transmits the force through the sleeve 16 which is embedded in the insulat ing body. Thesleeve 16 is positioned between the ends of the sleeves 12 and is therefore insulated from both of these sleeves and from the eye bolts and the wire in which the device is inserted; the device may therefore be adjusted to tighten or loosen the wire without danger of shock even if one of the eye bolts is connected to a high tension wire- It is obvious-that various changes may be made in the details of construction within the scope of the appended claims without departing from this invention, and it is therefore to be understood that this invention is not to be limited to the specific construction shown and described.

Having thus described the invention what bolt-receiving members completely embedded and anchored in the ends of said body, threaded bolts engaging said threaded members, and a tool engaging member completely embedded in said body intermediate said bolt receiving members.

4. A strain insulator comprising a body of insulating material, internally threaded sleeves embedded in the ends or" said body, threaded bolts engaging said sleeves, and a sleeve embedded in said body and extending transversely thereof adapted to be engaged by a tool or the like to turn said body.

In testimony whereof I affix my signature in presence of two Witnesses.

FESTUS Gr. WOODLOCK.

Witnesses:

J. BRUNINGA, M. E. P5113011, 

